diff options
| author | Hu Tao <hutao@cn.fujitsu.com> | 2014-09-10 17:05:48 +0800 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2014-09-12 15:43:06 +0200 |
| commit | 06247428be8037b3739280f82cb29efe8397695f (patch) | |
| tree | ea73080ed5104a4fbb89519da56469566b3a141c /qemu-img.texi | |
| parent | ffeaac9b4e23a3033e8120cc34bacadc09487f1b (diff) | |
raw-posix: Add falloc and full preallocation option
This patch adds a new option preallocation for raw format, and implements
falloc and full preallocation.
Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'qemu-img.texi')
| -rw-r--r-- | qemu-img.texi | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/qemu-img.texi b/qemu-img.texi index cc4668e64f..d64d05edda 100644 --- a/qemu-img.texi +++ b/qemu-img.texi @@ -419,6 +419,15 @@ Linux or NTFS on Windows), then only the written sectors will reserve space. Use @code{qemu-img info} to know the real size used by the image or @code{ls -ls} on Unix/Linux. +Supported options: +@table @code +@item preallocation +Preallocation mode (allowed values: @code{off}, @code{falloc}, @code{full}). +@code{falloc} mode preallocates space for image by calling posix_fallocate(). +@code{full} mode preallocates space for image by writing zeros to underlying +storage. +@end table + @item qcow2 QEMU image format, the most versatile format. Use it to have smaller images (useful if your filesystem does not supports holes, for example |